import { describe, expect, it } from 'vitest';
import { ChatSseTranslator, chatResponseToResponses, responsesToChatRequest } from './translate';

function chatSse(payload: string): string {
  return `data: ${payload}\n\n`;
}

function chatDelta(delta: Record<string, unknown>, finishReason?: string, usage?: unknown): string {
  const choice: Record<string, unknown> = { index: 0, delta };
  if (finishReason) choice.finish_reason = finishReason;
  const chunk: Record<string, unknown> = { id: 'chatcmpl_1', choices: [choice] };
  if (usage !== undefined) chunk.usage = usage;
  return JSON.stringify(chunk);
}

type EventTuple = Array<{ event: string; data: Record<string, any> }>;

function parseFrames(frames: string[]): EventTuple {
  return frames.join('').split('\n\n').filter(Boolean).map((raw) => {
    const event = /^event: (.*)$/mu.exec(raw)?.[1] ?? '';
    const data = /^data: (.*)$/mu.exec(raw)?.[1] ?? '{}';
    return { event, data: JSON.parse(data) as Record<string, unknown> };
  });
}

describe('responsesToChatRequest 请求方向', () => {
  it('instructions → developer 消息；input 字符串 → user 消息', () => {
    const chat = responsesToChatRequest({ model: 'qwen', instructions: '你是助手', input: '你好' });
    expect(chat.model).toBe('qwen');
    expect(chat.messages).toEqual([
      { role: 'developer', content: '你是助手' },
      { role: 'user', content: '你好' },
    ]);
    expect(chat.stream).toBe(false);
  });

  it('message 数组 content：文本合并、单文本压字符串、图片转 image_url、未知 part 丢弃留诊断', () => {
    const dropped: string[] = [];
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: [{
        type: 'message',
        role: 'user',
        content: [
          { type: 'input_text', text: '看图' },
          { type: 'input_image', image_url: 'http://x/y.png' },
          { type: 'input_image', image_url: { url: 'http://x/z.png' } },
          { type: 'input_file', file_id: 'f1' },
          { type: 'input_text', text: '回答我' },
        ],
      }],
    }, (m) => dropped.push(m));
    expect(chat.messages).toHaveLength(1);
    const content = chat.messages[0].content as Array<Record<string, unknown>>;
    expect(content).toEqual([
      { type: 'text', text: '看图' },
      { type: 'image_url', image_url: { url: 'http://x/y.png' } },
      { type: 'image_url', image_url: { url: 'http://x/z.png' } },
      { type: 'text', text: '回答我' },
    ]);
    expect(dropped.join(' ')).toContain('input_file×1');
  });

  it('function_call / function_call_output → assistant tool_calls 与 role:tool，call_id 原样对应', () => {
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: [
        { type: 'message', role: 'user', content: [{ type: 'input_text', text: 'ls' }] },
        { type: 'function_call', id: 'fc_1', call_id: 'call_9', name: 'shell', arguments: '{"cmd":["ls"]}' },
        { type: 'function_call_output', call_id: 'call_9', output: 'file-a\nfile-b' },
      ],
    });
    expect(chat.messages[1]).toEqual({
      role: 'assistant',
      content: null,
      tool_calls: [{ id: 'call_9', type: 'function', function: { name: 'shell', arguments: '{"cmd":["ls"]}' } }],
    });
    expect(chat.messages[2]).toEqual({ role: 'tool', tool_call_id: 'call_9', content: 'file-a\nfile-b' });
  });

  it('custom_tool_call 用 input 当 arguments；结构化 output 折叠成文本', () => {
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: [
        { type: 'custom_tool_call', call_id: 'c1', name: 'patch', input: '*** Begin Patch' },
        { type: 'custom_tool_call_output', call_id: 'c1', output: [{ type: 'input_text', text: 'ok' }] },
      ],
    });
    expect(chat.messages[0].tool_calls?.[0].function.arguments).toBe('*** Begin Patch');
    expect(chat.messages[1].content).toBe('ok');
  });

  it('reasoning / web_search_call 丢弃并留诊断', () => {
    const dropped: string[] = [];
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: [
        { type: 'reasoning', id: 'rs_1', summary: [{ type: 'summary_text', text: '想' }] },
        { type: 'message', role: 'user', content: 'hi' },
        { type: 'web_search_call', id: 'ws_1' },
      ],
    }, (m) => dropped.push(m));
    expect(chat.messages).toEqual([{ role: 'user', content: 'hi' }]);
    expect(dropped.join(' ')).toContain('reasoning×1');
    expect(dropped.join(' ')).toContain('web_search_call×1');
  });

  it('tools 扁平转嵌套，非 function 工具丢弃；tool_choice 各形态映射', () => {
    const dropped: string[] = [];
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: 'hi',
      tools: [
        { type: 'function', name: 'shell', description: '跑命令', parameters: { type: 'object' }, strict: true },
        { type: 'web_search' },
      ],
      tool_choice: { type: 'function', name: 'shell' },
    }, (m) => dropped.push(m));
    expect(chat.tools).toEqual([{ type: 'function', function: { name: 'shell', description: '跑命令', parameters: { type: 'object' } } }]);
    expect(chat.tool_choice).toEqual({ type: 'function', function: { name: 'shell' } });
    expect(dropped.join(' ')).toContain('tools×1');
  });

  it('Responses 专有字段绝不外泄（白名单式构建）', () => {
    const chat = responsesToChatRequest({
      model: 'qwen',
      input: 'hi',
      stream: true,
      store: false,
      include: ['reasoning.encrypted_content'],
      reasoning: { effort: 'low', summary: 'auto' },
      prompt_cache_key: 'thread-1',
      client_metadata: { session_id: 's' },
      metadata: { a: 1 },
      text: { verbosity: 'low' },
      service_tier: 'default',
      previous_response_id: 'resp_old',
      max_output_tokens: 123,
      temperature: 0.5,
      top_p: 0.9,
      parallel_tool_calls: false,
    });
    const serialized = JSON.stringify(chat);
    for (const banned of ['store', 'include', 'reasoning', 'prompt_cache_key', 'client_metadata', 'metadata', 'text', 'service_tier', 'previous_response_id']) {
      expect(serialized).not.toContain(`"${banned}"`);
    }
    expect(chat.max_tokens).toBe(123);
    expect(chat.temperature).toBe(0.5);
    expect(chat.top_p).toBe(0.9);
    expect(chat.parallel_tool_calls).toBe(false);
    expect(chat.stream).toBe(true);
    expect(chat.stream_options).toEqual({ include_usage: true });
  });
});

describe('chatResponseToResponses 非流式响应方向', () => {
  it('content/tool_calls/reasoning_content/usage 全量映射，length → incomplete', () => {
    const responses = chatResponseToResponses({
      choices: [{
        message: {
          content: 'hello',
          reasoning_content: 'thinking…',
          tool_calls: [{ id: 'call_1', type: 'function', function: { name: 'shell', arguments: '{}' } }],
        },
        finish_reason: 'stop',
      }],
      usage: { prompt_tokens: 3, completion_tokens: 4, total_tokens: 7 },
    }, 'resp_x');
    expect(responses.status).toBe('completed');
    expect((responses.usage as Record<string, unknown>).total_tokens).toBe(7);
    const output = responses.output as Array<Record<string, unknown>>;
    expect(output.map((item) => item.type)).toEqual(['reasoning', 'message', 'function_call']);
    expect(output[2]).toMatchObject({ call_id: 'call_1', name: 'shell', arguments: '{}' });
  });

  it('finish_reason=length → incomplete + max_output_tokens', () => {
    const responses = chatResponseToResponses({
      choices: [{ message: { content: ' truncated' }, finish_reason: 'length' }],
    }, 'resp_y');
    expect(responses.status).toBe('incomplete');
    expect(responses.incomplete_details).toEqual({ reason: 'max_output_tokens' });
  });
});

describe('ChatSseTranslator 流式状态机', () => {
  it('begin() 先发 created + in_progress，response.id 一致且必填', () => {
    const translator = new ChatSseTranslator();
    const events = parseFrames(translator.begin());
    expect(events.map((e) => e.event)).toEqual(['response.created', 'response.in_progress']);
    for (const e of events) expect(e.data.response.id).toMatch(/^resp_/);
    expect(translator.responseId).toBe(events[0].data.response.id);
  });

  it('纯文本流 golden：added → delta* → done(完整文本) → completed(usage)', () => {
    const translator = new ChatSseTranslator();
    translator.begin();
    const frames = [
      ...translator.push(
        chatSse(chatDelta({ role: 'assistant', content: '你' })) +
        chatSse(chatDelta({ content: '好' })) +
        chatSse(chatDelta({}, 'stop', { prompt_tokens: 5, completion_tokens: 2, total_tokens: 7 })) +
        chatSse('[DONE]'),
      ),
      ...translator.finish(),
    ];
    const events = parseFrames(frames);
    expect(events.map((e) => e.event)).toEqual([
      'response.output_item.added',
      'response.output_text.delta',
      'response.output_text.delta',
      'response.output_item.done',
      'response.completed',
    ]);
    const doneItem = events[3].data.item as Record<string, unknown>;
    expect(doneItem).toMatchObject({
      type: 'message',
      role: 'assistant',
      content: [{ type: 'output_text', text: '你好' }],
    });
    const completed = events[4].data.response as Record<string, unknown>;
    expect(completed.id).toBe(translator.responseId);
    expect(completed.usage).toMatchObject({ input_tokens: 5, output_tokens: 2, total_tokens: 7 });
  });

  it('data 行跨分包也能正确解析', () => {
    const translator = new ChatSseTranslator();
    const payload = chatDelta({ content: '分' });
    const whole = chatSse(payload);
    const mid = Math.floor(whole.indexOf('choices') + 3);
    const frames = [...translator.push(whole.slice(0, mid)), ...translator.push(whole.slice(mid))];
    const events = parseFrames(frames);
    expect(events.some((e) => e.event === 'response.output_text.delta' && e.data.delta === '分')).toBe(true);
  });

  it('reasoning_content 先开先闭：reasoning item 先 done，再开 message item', () => {
    const translator = new ChatSseTranslator();
    const frames = translator.push(
      chatSse(chatDelta({ reasoning_content: '想一步' })) +
      chatSse(chatDelta({ reasoning_content: '想两步' })) +
      chatSse(chatDelta({ content: '答' })) +
      chatSse('[DONE]'),
    );
    translator.finish();
    const events = parseFrames(frames);
    const kinds = events.map((e) => e.event);
    expect(kinds.filter((e) => e === 'response.reasoning_summary_text.delta')).toHaveLength(2);
    expect(kinds.indexOf('response.output_item.done')).toBeGreaterThan(-1);
    const reasoningDone = events.find((e) => e.event === 'response.output_item.done' && (e.data.item as Record<string, unknown>).type === 'reasoning');
    const messageAdded = events.find((e) => e.event === 'response.output_item.added' && (e.data.item as Record<string, unknown>).type === 'message');
    const reasoningDoneIndex = events.indexOf(reasoningDone!);
    const messageAddedIndex = events.indexOf(messageAdded!);
    expect(reasoningDoneIndex).toBeLessThan(messageAddedIndex);
    expect(reasoningDone?.data.item).toMatchObject({ summary: [{ type: 'summary_text', text: '想一步想两步' }] });
  });

  it('并行 tool_calls 按 index 归拢：参数跨 chunk 拼接，出现新 index 先收口前一个', () => {
    const translator = new ChatSseTranslator();
    const frames = [
      ...translator.push(
        chatSse(chatDelta({ tool_calls: [{ index: 0, id: 'call_a', function: { name: 'shell', arguments: '{"cm' } }] })) +
        chatSse(chatDelta({ tool_calls: [{ index: 0, function: { arguments: 'd":["ls"]}' } }, { index: 1, id: 'call_b', function: { name: 'read' } }] })) +
        chatSse(chatDelta({}, 'tool_calls')) +
        chatSse('[DONE]'),
      ),
      ...translator.finish(),
    ];
    const events = parseFrames(frames);
    const doneCalls = events.filter((e) => e.event === 'response.output_item.done')
      .map((e) => e.data.item as Record<string, unknown>)
      .filter((item) => item.type === 'function_call');
    expect(doneCalls).toHaveLength(2);
    expect(doneCalls[0]).toMatchObject({ call_id: 'call_a', name: 'shell', arguments: '{"cmd":["ls"]}' });
    expect(doneCalls[1]).toMatchObject({ call_id: 'call_b', name: 'read', arguments: '' });
  });

  it('finish_reason=length → completed 带 incomplete_details；无 usage 时省略 usage', () => {
    const translator = new ChatSseTranslator();
    const frames = [
      ...translator.push(chatSse(chatDelta({ content: 'x' }))),
      ...translator.push(chatSse(chatDelta({}, 'length'))),
      ...translator.finish(),
    ];
    const events = parseFrames(frames);
    const completed = events.find((e) => e.event === 'response.completed')!;
    expect(completed.data.response.status).toBe('incomplete');
    expect(completed.data.response.incomplete_details).toEqual({ reason: 'max_output_tokens' });
    expect(completed.data.response.usage).toBeUndefined();
  });

  it('上游 EOF（无 [DONE]）时 finish() 冲刷且幂等；坏 JSON 跳过；usage-only chunk 不产事件', () => {
    const translator = new ChatSseTranslator();
    const bad = translator.push('data: {not-json\n\n');
    expect(bad).toEqual([]);
    const usageOnly = translator.push(chatSse(JSON.stringify({ choices: [], usage: { prompt_tokens: 1, completion_tokens: 1 } })));
    expect(usageOnly).toEqual([]);
    const first = translator.finish();
    const second = translator.finish();
    expect(second).toEqual([]);
    expect(first.join('')).toContain('response.completed');
  });

  it('fail() 产出 response.failed 且幂等；finish 后 fail 不再产帧', () => {
    const translator = new ChatSseTranslator();
    const frames = translator.fail('上游炸了');
    expect(parseFrames(frames)[0].data.response.error).toEqual({ code: 'upstream_error', message: '上游炸了' });
    expect(translator.fail('again')).toEqual([]);
    const fresh = new ChatSseTranslator();
    fresh.finish();
    expect(fresh.fail('late')).toEqual([]);
  });
});